1

Safe but:
Whether it works or not is another question. As for the dose, there is no scientific study on this especially given that the potency of the active ingredient(s) among different batches of the plants are not known and have not been standardized. Having said that, most people should be able to tolerate up to 4 cups of herbal tea daily as a rule of thumb- again just my personal opinion.
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The medical term is cephalalgia. It is a feeling of pain that can occur on either both sides or just one side of the head or neck. Headaches can be sharp, dull, or throbbing, and can radiate to different areas of the head. They typically last less than an hour but can last for several days.
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2

Migraine treatment:
Feverfew, a migraine herbal supplement can help as an adjunctive to another migraine modality treatment. Once a diagnosis of migraine has been made, effective management of migraine involves specific strategies and medication. See an orofacial pain or headache specialist for evaluation and professional management.
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3

Yes:
Where as feverfew need to be avoided with ssris due to effects on platelets, & 5htp need to be avoided with ssris, due to an increased risk of seratonin syndrome, (too much seratonin in the system) there appear to be no interaction between the two.
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4

How Much Excedrin?:
A more important issue is how ofter you take the excedrin. You may be causing rebound headaches which in many ways are more difficult to treat than migraine. Feverfew is a popular herb that seems to prevent migraine.I am not aware of any major interactions as does st. John's wort, for example. It is probably more important to limit your excedrin than worry about the feverfew interactions.
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5

Migraine management:
Once a diagnosis of migraine has been made, effective management of migraine involves three specific strategies: 1) patient education, 2) nonpharmacological management, and 3) pharmacological (medical) management. See an orofacial pain or headache specialist for evaluation and professional management.
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7

Feverfew:
This plant is pretty common in the UK as well as other parts of Europe and America. Latin names are Tanacetum parthenium and Chrysanthemum parthenium. Common names are feverfew, bachelor's buttons and featherfew. Feverfew is still the most common name. You may need to check with an herbalist or naturopath if having difficulty finding it.
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8

Most likely, yes.:
There is little research on feverfew, as it is an herbal, but from what is known about it, it does not act in the same way that Pamelor (nortriptyline) does, so there should not be an interaction.
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10

Try all then...:
All are proven effective but some individuals respond better to some than others so you need to try all to see what works best for you. Since each reduce migraines but seldom stop them entirely best benefit most likely from taking all. If you go months with no migraine can try stopping one at a time to see what's working. Also try Magnesium taurate or citrate 600 mg/day. See comment for doses:
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